6 Selecting an External Heatsink
24 YASKAWA ELECTRIC TOBP C710606 21D YASKAWA AC Drive - V1000 Finless Installation Guide
NOTICE: Due to uneven compound thickness, uneven heat generation across the heatsink plate or other
factors, the actual heatsink plate temperature (monitored in U4-08) can be slightly different from the
calculated value. An oH drive fault may occur if the heatsink plate temperature exceeds the maximum
allowable value.
◆ Heatsink Selection Example
This example shows heatsink selection for a CIMR-V2A0006 drive in Normal Duty (ND)
mode.The data required are listed in the table below.
Item Value
P
Loss
27.5 W
T
HSP_max
90°C
T
Amb
40°C
Rθ
HSP
0.05 K/W
Rθ
HSP-EHS
A
th
H = 128 mm, D = 68 mm,
A
th
= 0.7 x 0.128 m x 0.068 m = 6.1 x 10
-3
m
2
λ
Comp
0.8 W/(mxK)
Thermal conductivity of “Thermal Compound G746” (Shin-Etsu Chemical Co.,
Ltd)
d
Comp
Recommended compound thickness: 100 μm
Rθ
HSP_EHS
=
= 0.02 K/W
100 μm
0.8 W/(mK) × 6.1 × 10
-3
m
2
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